linux-kernel - Re: [GIT PULL] kdbus for 4.1-rc1

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Message-ID: <CALCETrVz8-24U5iBdX4P3hrGLXvpiX72o=pw6uW2yGzMmGy+ow@mail.gmail.com>
Date:	Wed, 29 Apr 2015 12:42:02 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Austin S Hemmelgarn <ahferroin7@...il.com>
Cc:	Harald Hoyer <harald@...hat.com>, Arnd Bergmann <arnd@...db.de>,
	Havoc Pennington <hp@...ox.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jiri Kosina <jkosina@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Mack <daniel@...que.org>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Lukasz Skalski <l.skalski@...sung.com>,
	"Theodore Ts'o" <tytso@....edu>, Tom Gundersen <teg@...m.no>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	David Herrmann <dh.herrmann@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	John Stoffel <john@...ffel.org>,
	Djalal Harouni <tixxdz@...ndz.org>
Subject: Re: [GIT PULL] kdbus for 4.1-rc1

On Wed, Apr 29, 2015 at 12:30 PM, Austin S Hemmelgarn
<ahferroin7@...il.com> wrote:
> On 2015-04-29 14:54, Andy Lutomirski wrote:
>>
>> On Apr 29, 2015 5:48 AM, "Harald Hoyer" <harald@...hat.com> wrote:
>>>
>>>
>>>   * Being in the kernel closes a lot of races which can't be fixed with
>>>     the current userspace solutions.  For example, with kdbus, there is a
>>>     way a client can disconnect from a bus, but do so only if no further
>>>     messages present in its queue, which is crucial for implementing
>>>     race-free "exit-on-idle" services
>>
>>
>> This can be implemented in userspace.
>>
>> Client to dbus daemon: may I exit now?
>> Dbus daemon to client: yes (and no more messages) or no
>>
> Depending on how this is implemented, there would be a potential issue if a
> message arrived for the client after the daemon told it it could exit, but
> before it finished shutdown, in which case the message might get lost.
>

Then implement it the right way?  The client sends some kind of
sequence number with its request.

--Andy
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